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For parts identification: anodize or what?

I simply want to tell two nearly identical A380 cast aluminum cast parts from each other prior to finish machining and subsequent component assembly by coloring one of them. There is no end use corrosion requirements. What are the least expensive 2 or 3 options?

John Eldridge
- Sallisaw, OK, US
2004

Consider degrease, aluminium wash and paint. All by immersion.

Guillermo Marrufo
Monterrey, NL, Mexico
2004

Felt tip pen.

Tom Gallant
- Long Beach, California, USA
2004

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